Adult rauna crystalwings are at their happiest when they are working together with water. Persuading a stream to turn directly into the solid rock wall, thereby slowly creating a tunnel, or letting the water wash high up on the tunnel's walls, expanding the tunnel into a cavern, gives them a sense of great joy and accomplishment. A friendly and peaceloving species, they are even willing to use this ability to assist humans, provided that they are asked politely, and given offerings of opals, their favourite food.

The rauna crystalwings are only found in the depths of the Tetzcotal jungle. There they make their home in a wide-reaching underground system of tunnels and caverns, a home they have built using their unique bond with water; Adult raunas are able to persuade any body of water to change its course. Through using the water's power they can drill through virtually anything, thus easily expanding their underground home. It is thought that this bond is at its strongest during full moon, at which time their citrine-coloured gems are rumoured to glow with the light of the moon.